Elsa Comes to Storybrooke|A mysterious woman emerges from the portal that Emma used to return home.|A glistening, icy figure emerges from the time portal that Emma used to return to Storybooke. The woman stretches out her arm to create icicles around her, and as she walks away, she leaves the ground beneath her frozen. From Once Upon a Time Season 3 finale, "There's No Place Like Home."

WATCH: On the Once Upon a Time season finale, Frozen's Elsa traveled through the time portal to Storybrooke.

The Story of Frozen: Making a Disney Animated Classicis an all-new, original special that ventures behind-the-scenes for an exclusive look at the origins and evolution of the Academy Award®-winning film Frozen, a modern movie based on a timeless tale that is now the biggest animated feature of all time.

Frozen directors Jennifer Lee and Chris Buck discuss the making of an instant classic.

Viewers will get a rare look inside Walt Disney Animation Studios and unprecedented access to the creative team that brought Frozen to life. Throughout the one-hour special, the audience will hear from Frozen stars Kristen Bell and Idina Menzel, the directors Jennifer Lee and Chris Buck, songwriters, producer and artists and chief creative officer — the team who dreamed of making a cherished Hans Christian Andersen story into a big screen animated musical.

Check out this teaser trailer for Season 4 and tune in to the season premiere SUNDAY, SEPTEMBER 28 8|7c.

Viewers will take a journey to the beautiful Norwegian villages and landscapes that inspired the look of Arendelle — the fictional kingdom — and see images and footage from the research trips to Norway, Quebec and points beyond that helped create the film's unforgettable look and feel.

The Story of Frozen: Making a Disney Animated Classic airs on ABC TUESDAY, SEPTEMBER 2 8|7c.

Once Upon a Timeseason 4, featuring Elsa, Anna and more characters from Frozen, will premiere SUNDAY SEPT 28 8|7c on ABC!